DefaultHttpClient httpClient = new DefaultHttpClient();//http://tulogin.erzao.org/tu-login/_____localhost:8080
		HttpPost method = new HttpPost("http://localhost:8080/tu-login/tuloginMethod");

		JSONObject jsonParam = new JSONObject();
		jsonParam.put("phone", phone);
		jsonParam.put("password", password);
		jsonParam.put("requrl", requrl);

		StringEntity entity = new StringEntity(jsonParam.toString(), "utf-8");
		entity.setContentEncoding("UTF-8");
		entity.setContentType("application/json");
		method.setEntity(entity);
		HttpResponse resGet;
 

上面的程式碼是設定與伺服器連線的，包括連線伺服器的方法，以及傳輸資料的格式，可編碼方式等。

下面的程式碼是處理伺服器的返回值的。

try {
			//通過DefaultHttpClient 來獲得返回的引數（值）
			resGet = httpClient.execute(method);
			//將返回值設定編碼格式，（避免亂碼）
			String resData = EntityUtils.toString(resGet.getEntity(),"utf-8");
			//通過net.sf.json.JSONObject 來解析字串
			JSONObject resJSON = JSONObject.fromObject(resData);
			//把json中的user物件獲取，並強轉。
			Object userjson = resJSON.get("user");
			String userString = userjson.toString();
			
			//通過com.google.gson.Gson 來處理json 型別的user物件。
			Gson gson = new Gson();
			
			//user就是轉換後的物件。

			//在這裡，我對com.google.gson.JsonObject有點疑問，為啥這個不能解析返回的字串呢？
			//這個類有什麼作用？
			JsonObject jsonObj = new JsonObject();
			jsonObj.getAsJsonObject(resData);
		
			if("A00000".equals(resJSON.get("code"))){
				User user = gson.fromJson((String) userString, User.class);
				String token = (String)resJSON.get("token");
				securityUtil.addCookieToken(request,response,token,user.getId());
				request.getSession().setAttribute("user", user);
			}
			
			
			if ( !"A00000".equals(resJSON.get("code"))) {
				result = resJSON.get("data");
			}/*else{
			result = securityUtil.getReqURL(request,response);
			}*/
			
			
			resultCode = resJSON.get("code");
		} catch (ClassCastException e) {
			logger.error(e.getMessage());
			resultCode = ResultCode.INTERNAL_ERROR;
			result = e.getMessage();
		}catch (ClientProtocolException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
 

再下面是伺服器處理請求的。

@RequestMapping(value = "/tuloginMethod")
	public void login(@RequestBody Map<String, Object> map,
			HttpServletRequest request, HttpServletResponse response) throws UnAuthedException {
		response.setCharacterEncoding("UTF-8");
		String phone = (String) map.get("phone");
		String password = Md5Util.md5((String) map.get("password"));
		ResultCode resultCode = ResultCode.SUCCEED;
		Object result = null;
		User user = null;
		String token = null;
		
		try {
			ParamChecker.notEmpty("phone", phone);
			ParamChecker.notEmpty("password", password);
			
			
			user = UserService.login(request, response, phone, password);
			token = (String) request.getAttribute("token");
		} catch (UnAuthedException e) {
			logger.error(e.getMessage());
			resultCode = e.getResultCode();
			result = e.getMessage();

		} catch (Exception e) {
			logger.error(e.getMessage(), e);
			resultCode = ResultCode.INTERNAL_ERROR;
			result = e.getMessage();
		}
		setResponseMethod(response, resultCode, result, user , token);
	}
 

並返回值。

下面的程式碼是最後返回的時候。

 protected void setResponseMethod(HttpServletResponse resp, ResultCode resultCode,
            Object result,User user ,String token , String callback) {
        try {
        	resp.setCharacterEncoding("utf-8");
            PrintWriter out = resp.getWriter();
            Map<String, Object> ret = new LinkedHashMap<String, Object>();
            ret.put("code", resultCode.getCode());
            ret.put("data", result);
            ret.put("user", user);
            ret.put("token", token);
            String responseStr = GSON.toJson(ret);
            out.println(responseStr);
            out.close();
            resp.setCharacterEncoding("utf-8");
            
            
        } catch (Exception e) {
            logger.error(e.getMessage(), e);
        }
    }